Dust-collecting system



(No Modeh) 2 Sheets-Sheet '1.

H. L. DAY.

DUST COLLECTING SYSTEM.

No. 532,144. Patented Jan. 8, 18%.

2 Sheet-Sheet 2.

(No Model.)

. H. L. DAY.

DUST UOLLECTING SYSTEM. N0. 532,144. Patented Jan. 8, 1895.

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' UNITED STATES "PATENT QFFICE.

HENRY L. DAY, OF MINNEAPOLIS, MINNESOTA.

DUST-COLLECTING SYSTEM.

SPECIFICATION forming part of Letters Patent No. 532,144, dated January 8, 1895.

Application filed June 16, ,1893. Serial No. 477,779 (No model.)

T0 on whom it may concern:

Be it knownthatl, HENRY L.'DAY,Of.tl1e city of Minneapolis, county of Hennepin, State of Minnesota, having invented certain new and useful Improvements in Dust-Oollecting Systems, of which the following is a specification.

This invention relates to improvements in that class of devices designed for conveying, by pneumatic means, fine material, such as shavings, saw-dust,'dust, &;c., and delivering the same directly to furnaces or to shavings rooms, or to dust-houses or other receptacles; and the invention consists generally in a dust-collecting system employing a suitable fan or fans by which the material is taken up from the machine where it is made or separated from other material operated upon by said machine, and means by which alarge portion of air is permitted to escape near the fan or fans and the material brought into a more compact form, to be conveyed either to the furnace or to any suitable receptacle, and whereby a much smaller pipe or conductor may be used for conveying the air current and material without creating any back pressure upon the fan.

The invention consists further in the constructions and combinations hereinafter described and particularly pointed out in the claims, and will be more readily understood by reference to the accompanying drawings, in which-- Figure 1 is a plan View of .a portion of a dust-collecting system embodying my invention. Fig. 2 is a similar view showing a portion of the conductor, with the top broken away to show the interior thereof. Fig. 3 is a View showing the system arranged for-taking the material from a large number of machines and employing several fans with means for bringing the material into a more compact form so as to'permit the material from a large number of machines to be carried away by a single conductor. Fig. 4 is a side elevation of the fan having the vertical discharge showing also a modified arrangement of the condnctors.

In the drawings, 2 represents a suitable fan by which the material to be conveyed is taken up through suitable main pipes 3 and branch pipes 5, from the planing machine, wheat cleaning machine or other apparatus, where the shavings or fine material are made or separated from the material operated upon. This fan may be arranged in any suitable manner, and any suitablenumber of pipes may be connected therewith.

The fan connects at its outlet side with a suitable blast or outlet pipe 7, in which the material and the air from the fan are conducted. portion 9, which causes the particles of material carried by the air-current to be thrown against the inner surface of the outer wall of the curved portion of the conductor, whereby nearly all of the material will be massed against this wall and will pass along in contact therewith or in close proximity thereto.

The conductor 7 terminates preferably with the curved portion 9, and connected to this conductor is the smaller conductor 11 located at the outside of the curved portion of the conductor, and the conductor 13 located at the inner side of the curved portion of the conductor. These two conductors are equal in area to the conductor 7 so that they receive the air current from the conductor 7 This pipe is provided with a curved without creating any friction or causing any back pressure upon the fan. The shavings, dust or fine material enters the conductor 11 with the portion of the air current that enters' said conductor. The portion of the air current that enters the conductor 13 will be substantially clear of material but will carry some fine dust. The conductor 13 leads to a suitable dust-collector 15. This dust-collector is preferably that shown and described in my application for patent, filed April 28, 1893,

Serial No. 472,166, in which the dust is separated from the air by centrifugal force and gravitation, and the air escapes through a circumferential or tangential outlet space or opening-l7. The dust from this dust-collector enters a pipe 19 and is led back to the suction pipe 3 by which it is carried back to the fan to be again carried into the air current from the exit side of the fan.

The conductor 11 while of considerably less area than the conductor 7 is sufliciently large to permit the air current to travel freely therein after a portion of the current has entered the conductor 13, and the shavings or other material will pass along in the conductor 11 and will be conveyed either to the shavings house, dust room or to a suitable furnace for fuel therefor. If preferred, as shown in Fig. 3, the conductor 11 may lead to a dust-collector 21 similar to the dust collector 15, and from this dust-collector the material brought into a more compact form will pass through the conductor 23 to a conductor 25 leading to a fan 27.

There may be several of the conductors 11 and dust collectors 21 all connecting with the conductor 25, as shown in Fig. 3.

The fan 27 may connect to a conductor that is a duplicate of the conductor 7 and provided with the curved portion 9, or it may connect to a vertical conductor 29 provided with a curved pipe 31 leading from the under side of the curved portion 33 to another dust-collector 35 having a pipe 37 returning to the conductor 25, as shown in Fig. 4 and in the upper part of Fig. 3, the upper portion of the pipe 29 connecting to a conductor 39 corresponding to the conductor 11, and leading either to afuel feeder, a shavings house, dust room or to another dust collector.

In each instance it will be noted that by providing the curved portion in the blast-pipe leading from the fan, I am enabled to bring the greater portion of the material in the air current to the outer side of the curved portion of the conductor and thus lead it off into a conductor of less size, while the remaining portion of the air current enters a conductor leading form the inner side of the curved portion of the conductor, where the air is practically free from dust and shavings; and this part of the air current after having the slight remaining dust and material removed therefrom is permitted to escape into the atmosphere, while the dust goes back to the fan and is again brought into the blast-pipe discharging therefrom.

The system is capable of multiplication indefinitely as any desired number of conductors and dust-collectors may be employed and the material from all of them may finally be brought into a single conductor to be led directly to a fuel feeder, shavings house, dust room, &c.

The special advantages of this system of in this case there is much less friction from the air in the pipe and hence it takes less,

power to force the air through the pipe.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination, of fan, a blast-pipe connected to the exit side of said fan, said blast-pipe having a bent or curved portion, with animperforate outer Wall against which wall the material carried by the air current will be thrown, a conductor connected to the outer side of said curved portion to receive the material laden air, an outlet for the partiallypurified air at the inner side of said curved portion, a dust collector arranged to receive the partially purified air from said last outlet, and a pipe to direct the dust from said dust collector to the inlet of said fan, substantially as described.

2. The combination, in a system for conveying material from a fan, and reducing the body of air conveying said material to the minimum required, and delivering the surplus air nearthe fan, of a fan, a blast-pipe having a bent or curved portion, a conductor for the material laden air, a conductor for the partially purified air, a dust collector arranged to receive said partially purified air, and a pipe to direct the separated dust from said dust collector to the inlet side of said fan, substantially as described.

In testimony whereof I have hereunto set my hand this 11th day of May, 1893.

HENRY L. DAY.

In presence of- A. 0. PAUL,

F. S. LYON. 

